Window heater



FIG. 1 is a top front perspective view of a window heater, showing our new design;

FIG. 2 is a top rear perspective view thereof;

FIG. 3 is a bottom perspective view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a top front perspective view of a second embodiment thereof;

FIG. 6 is a top rear perspective view of said second embodiment thereof;

FIG. 7 is a bottom perspective view of said second embodiment thereof;

FIG. 8 is a left side elevation view of said second embodiment thereof. 

The ornamental design for a window heater, substantially as shown and described. 